<!DOCTYPE HTML>
<html lang="zh-CN">


<head>
    <meta charset="utf-8">
    <meta name="keywords" content="Zookeeper学习, Max|Blog">
    <meta name="description" content="life is a fucking movie">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
    <meta name="renderer" content="webkit|ie-stand|ie-comp">
    <meta name="mobile-web-app-capable" content="yes">
    <meta name="format-detection" content="telephone=no">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
    <!-- Global site tag (gtag.js) - Google Analytics -->


    <title>Zookeeper学习 | Max|Blog</title>
    <link rel="icon" type="image/png" href="/favicon.png">

    <link rel="stylesheet" type="text/css" href="/libs/awesome/css/all.css">
    <link rel="stylesheet" type="text/css" href="/libs/materialize/materialize.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/aos/aos.css">
    <link rel="stylesheet" type="text/css" href="/libs/animate/animate.min.css">
    <link rel="stylesheet" type="text/css" href="/libs/lightGallery/css/lightgallery.min.css">
    <link rel="stylesheet" type="text/css" href="/css/matery.css">
    <link rel="stylesheet" type="text/css" href="/css/my.css">

    <script src="/libs/jquery/jquery.min.js"></script>

<meta name="generator" content="Hexo 5.3.0"><link rel="alternate" href="/atom.xml" title="Max|Blog" type="application/atom+xml">
</head>




<body>
    <header class="navbar-fixed">
    <nav id="headNav" class="bg-color nav-transparent">
        <div id="navContainer" class="nav-wrapper container">
            <div class="brand-logo">
                <a href="/" class="waves-effect waves-light">
                    
                    <img src="/medias/logo.png" class="logo-img" alt="LOGO">
                    
                    <span class="logo-span">Max|Blog</span>
                </a>
            </div>
            

<a href="#" data-target="mobile-nav" class="sidenav-trigger button-collapse"><i class="fas fa-bars"></i></a>
<ul class="right nav-menu">
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/" class="waves-effect waves-light">
      
      <i class="fas fa-home" style="zoom: 0.6;"></i>
      
      <span>首页</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/tags" class="waves-effect waves-light">
      
      <i class="fas fa-tags" style="zoom: 0.6;"></i>
      
      <span>标签</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/categories" class="waves-effect waves-light">
      
      <i class="fas fa-bookmark" style="zoom: 0.6;"></i>
      
      <span>分类</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/archives" class="waves-effect waves-light">
      
      <i class="fas fa-archive" style="zoom: 0.6;"></i>
      
      <span>归档</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/about" class="waves-effect waves-light">
      
      <i class="fas fa-user-circle" style="zoom: 0.6;"></i>
      
      <span>关于</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/contact" class="waves-effect waves-light">
      
      <i class="fas fa-comments" style="zoom: 0.6;"></i>
      
      <span>留言板</span>
    </a>
    
  </li>
  
  <li class="hide-on-med-and-down nav-item">
    
    <a href="/friends" class="waves-effect waves-light">
      
      <i class="fas fa-address-book" style="zoom: 0.6;"></i>
      
      <span>友情链接</span>
    </a>
    
  </li>
  
  <li>
    <a href="#searchModal" class="modal-trigger waves-effect waves-light">
      <i id="searchIcon" class="fas fa-search" title="搜索" style="zoom: 0.85;"></i>
    </a>
  </li>
</ul>


<div id="mobile-nav" class="side-nav sidenav">

    <div class="mobile-head bg-color">
        
        <img src="/medias/logo.png" class="logo-img circle responsive-img">
        
        <div class="logo-name">Max|Blog</div>
        <div class="logo-desc">
            
            life is a fucking movie
            
        </div>
    </div>

    

    <ul class="menu-list mobile-menu-list">
        
        <li class="m-nav-item">
	  
		<a href="/" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-home"></i>
			
			首页
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/tags" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-tags"></i>
			
			标签
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/categories" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-bookmark"></i>
			
			分类
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/archives" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-archive"></i>
			
			归档
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/about" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-user-circle"></i>
			
			关于
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/contact" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-comments"></i>
			
			留言板
		</a>
          
        </li>
        
        <li class="m-nav-item">
	  
		<a href="/friends" class="waves-effect waves-light">
			
			    <i class="fa-fw fas fa-address-book"></i>
			
			友情链接
		</a>
          
        </li>
        
        
        <li><div class="divider"></div></li>
        <li>
            <a href="https://github.com/zhy2021/zhy2021.github.io" class="waves-effect waves-light" target="_blank">
                <i class="fab fa-github-square fa-fw"></i>Fork Me
            </a>
        </li>
        
    </ul>
</div>


        </div>

        
            <style>
    .nav-transparent .github-corner {
        display: none !important;
    }

    .github-corner {
        position: absolute;
        z-index: 10;
        top: 0;
        right: 0;
        border: 0;
        transform: scale(1.1);
    }

    .github-corner svg {
        color: #0f9d58;
        fill: #fff;
        height: 64px;
        width: 64px;
    }

    .github-corner:hover .octo-arm {
        animation: a 0.56s ease-in-out;
    }

    .github-corner .octo-arm {
        animation: none;
    }

    @keyframes a {
        0%,
        to {
            transform: rotate(0);
        }
        20%,
        60% {
            transform: rotate(-25deg);
        }
        40%,
        80% {
            transform: rotate(10deg);
        }
    }
</style>

<a href="https://github.com/zhy2021/zhy2021.github.io" class="github-corner tooltipped hide-on-med-and-down" target="_blank"
   data-tooltip="Fork Me" data-position="left" data-delay="50">
    <svg viewBox="0 0 250 250" aria-hidden="true">
        <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
        <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2"
              fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>
        <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z"
              fill="currentColor" class="octo-body"></path>
    </svg>
</a>
        
    </nav>

</header>

    



<div class="bg-cover pd-header post-cover" style="background-image: url('/medias/featureimages/2.jpg')">
    <div class="container" style="right: 0px;left: 0px;">
        <div class="row">
            <div class="col s12 m12 l12">
                <div class="brand">
                    <h1 class="description center-align post-title">Zookeeper学习</h1>
                </div>
            </div>
        </div>
    </div>
</div>




<main class="post-container content">

    
    <link rel="stylesheet" href="/libs/tocbot/tocbot.css">
<style>
    #articleContent h1::before,
    #articleContent h2::before,
    #articleContent h3::before,
    #articleContent h4::before,
    #articleContent h5::before,
    #articleContent h6::before {
        display: block;
        content: " ";
        height: 100px;
        margin-top: -100px;
        visibility: hidden;
    }

    #articleContent :focus {
        outline: none;
    }

    .toc-fixed {
        position: fixed;
        top: 64px;
    }

    .toc-widget {
        width: 345px;
        padding-left: 20px;
    }

    .toc-widget .toc-title {
        padding: 35px 0 15px 17px;
        font-size: 1.5rem;
        font-weight: bold;
        line-height: 1.5rem;
    }

    .toc-widget ol {
        padding: 0;
        list-style: none;
    }

    #toc-content {
        padding-bottom: 30px;
        overflow: auto;
    }

    #toc-content ol {
        padding-left: 10px;
    }

    #toc-content ol li {
        padding-left: 10px;
    }

    #toc-content .toc-link:hover {
        color: #42b983;
        font-weight: 700;
        text-decoration: underline;
    }

    #toc-content .toc-link::before {
        background-color: transparent;
        max-height: 25px;

        position: absolute;
        right: 23.5vw;
        display: block;
    }

    #toc-content .is-active-link {
        color: #42b983;
    }

    #floating-toc-btn {
        position: fixed;
        right: 15px;
        bottom: 76px;
        padding-top: 15px;
        margin-bottom: 0;
        z-index: 998;
    }

    #floating-toc-btn .btn-floating {
        width: 48px;
        height: 48px;
    }

    #floating-toc-btn .btn-floating i {
        line-height: 48px;
        font-size: 1.4rem;
    }
</style>
<div class="row">
    <div id="main-content" class="col s12 m12 l9">
        <!-- 文章内容详情 -->
<div id="artDetail">
    <div class="card">
        <div class="card-content article-info">
            <div class="row tag-cate">
                <div class="col s7">
                    
                    <div class="article-tag">
                        
                            <a href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E6%8A%80%E6%9C%AF/">
                                <span class="chip bg-color">分布式技术</span>
                            </a>
                        
                            <a href="/tags/Zookeeper/">
                                <span class="chip bg-color">Zookeeper</span>
                            </a>
                        
                    </div>
                    
                </div>
                <div class="col s5 right-align">
                    
                    <div class="post-cate">
                        <i class="fas fa-bookmark fa-fw icon-category"></i>
                        
                            <a href="/categories/Zookeeper/" class="post-category">
                                Zookeeper
                            </a>
                        
                    </div>
                    
                </div>
            </div>

            <div class="post-info">
                
                <div class="post-date info-break-policy">
                    <i class="far fa-calendar-minus fa-fw"></i>发布日期:&nbsp;&nbsp;
                    2020-07-27
                </div>
                

                

                
                <div class="info-break-policy">
                    <i class="far fa-file-word fa-fw"></i>文章字数:&nbsp;&nbsp;
                    3.2k
                </div>
                

                
                <div class="info-break-policy">
                    <i class="far fa-clock fa-fw"></i>阅读时长:&nbsp;&nbsp;
                    13 分
                </div>
                

                
                    <div id="busuanzi_container_page_pv" class="info-break-policy">
                        <i class="far fa-eye fa-fw"></i>阅读次数:&nbsp;&nbsp;
                        <span id="busuanzi_value_page_pv"></span>
                    </div>
				
            </div>
        </div>
        <hr class="clearfix">

        
        <!-- 是否加载使用自带的 prismjs. -->
        <link rel="stylesheet" href="/libs/prism/prism.css">
        

        

        <div class="card-content article-card-content">
            <div id="articleContent">
                <h1 id="Zookeeper-学习与实战"><a href="#Zookeeper-学习与实战" class="headerlink" title="Zookeeper 学习与实战"></a>Zookeeper 学习与实战</h1><p>前置知识：</p>
<ul>
<li>掌握 Linux 操作系统的使用</li>
<li>掌握 Maven、SpringBoot 的使用</li>
</ul>
<h2 id="简介"><a href="#简介" class="headerlink" title="简介"></a>简介</h2><blockquote>
<p>Zookeeper 官网：<a target="_blank" rel="noopener" href="http://zookeeper.apache.org/">http://zookeeper.apache.org/</a></p>
</blockquote>
<blockquote>
<p>Zookeeper 是 Apache 的一个分布式服务框架，是 Apache Hadoop 的一个子项目。官方文档上这么解释 Zookeeper，它主要是用来解决分布式应用中经常遇到的一些数据管理问题，如：统一命名服务、状态同步服务、集群管理、分布式应用配置项的管理等。</p>
</blockquote>
<blockquote>
<p>简单来说 zookeeper=文件系统+监听通知机制。</p>
</blockquote>
<h2 id="Zookeeper-存储结构"><a href="#Zookeeper-存储结构" class="headerlink" title="Zookeeper 存储结构"></a>Zookeeper 存储结构</h2><p><img src="https://s1.ax1x.com/2020/07/30/aK7mUx.png" alt="aK7mUx.png"></p>
<ol>
<li>Znode<blockquote>
<p>在 Zookeeper 中，znode 是一个跟 Unix 文件系统路径相似的节点，可以向节点存储数据或者获取数据。<br>Zookeeper 底层是一套数据结构。这个存储结构是一个树形结构，其上的每一个节点，我们称之为“znode”<br>Zookeeper 中的数据是按照“树”结构进行存储的。而且 znode 节点还分为 4 中不同的类型。<br>每一个 znode 默认能够存储 1MB 的数据（对于记录状态性质的数据来说，够了）<br>可以使用 zkCli 命令，登录到 Zookeeper 上，并通过 ls、create、delete、get、set 等命令操作这些 znode 节点。</p>
</blockquote>
</li>
<li>Znode 节点类型<ul>
<li><code>persistent</code> 持久化目录节点<ul>
<li>客户端与 zookeeper 断开连接后，该节点依旧存在。</li>
</ul>
</li>
<li><code>persistent_sequential</code> 持久化顺序编号目录节点<ul>
<li>客户端与 zookeeper 断开连接后，该节点依旧存在，只是 Zookeeper 给该节点名称进行顺序编号</li>
</ul>
</li>
<li><code>ephemeral</code> 临时目录节点<ul>
<li>客户端与 zookeeper 断开连接后，该节点被删除。</li>
</ul>
</li>
<li><code>ephemeral_sequential</code> 临时顺序编号目录节点<ul>
<li>客户端与 zookeeper 断开连接后，该节点被删除，只是 Zookeeper 给该节点名称进行顺序编号。</li>
</ul>
</li>
</ul>
</li>
</ol>
<h2 id="监听通知机制"><a href="#监听通知机制" class="headerlink" title="监听通知机制"></a>监听通知机制</h2><blockquote>
<p>Zookeeper 是使用观察者设计模式来设计的。当客户端注册监听它关心的目录节点时，当目录节点发生变化（数据改变、被删除、子目录节点增加删除）时，Zookeeper 会通知客户端。</p>
</blockquote>
<h2 id="安装-zookeeper-流程"><a href="#安装-zookeeper-流程" class="headerlink" title="安装 zookeeper 流程"></a>安装 zookeeper 流程</h2><h3 id="单机版-zookeeper"><a href="#单机版-zookeeper" class="headerlink" title="单机版 zookeeper"></a>单机版 zookeeper</h3><p>前置条件：<strong>Linux 操作系统，并且安装有 JDK</strong></p>
<ul>
<li><p>上传 Zookeeper 到 linux 系统<br><img src="https://s1.ax1x.com/2020/07/30/aKzT1I.png" alt="aKzT1I.png"></p>
</li>
<li><p>解压 Zookeeper 压缩包,并把 copy 到<code>/usr/local/下</code></p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token function">tar</span> -zxvf zookeeper-3.6.0.tar.gz
<span class="token function">cp</span> zookeeper-3.6.0 /usr/local/zookeeper -r<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre></li>
<li><p>Zookeeper 目录结构：</p>
<p><img src="https://s1.ax1x.com/2020/07/30/aMEGUx.png" alt="目录结构"></p>
<pre class="line-numbers language-txt" data-language="txt"><code class="language-txt">1. bin：放置运行脚本和工具脚本，
2. conf：zookeeper 默认读取配置的目录，里面会有默认的配置文件
3. docs：zookeeper 相关的文档
4. lib：zookeeper 核心的 jar
5. logs：zookeeper 日志<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>配置 Zookeeper</p>
<blockquote>
<p><strong>Zookeeper 在启动时默认的去 conf 目录下查找个名称为 zoo.cfg 的配置文件</strong><br>conf 目录下有一个 zoo_simple.cfg 的文件，我们只需要把他 copy 一份，改名为 zoo.cfg 即可。</p>
</blockquote>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token function">cp</span> zoo_sample.cfg zoo.cfg<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<p><strong>修改 zoo.cfg 的配置</strong></p>
<ul>
<li><p>设置缓存路径<br><img src="https://s1.ax1x.com/2020/07/30/aMZunJ.png" alt="zoo.cfg"></p>
<p>dataDir 设置数据缓存路径<br>可以在根目录下创建一个 data 目录，用于存放数据缓存</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token function">mkdir</span> data<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre></li>
</ul>
</li>
<li><p>启动 Zookeeper</p>
<ul>
<li><code>./zkServer.sh start</code> <strong>默认的会去 conf 目录下加载 zoo.cfg 配置文件</strong></li>
<li><code>./zkServer.sh start</code> <strong>配置文件的路径</strong></li>
</ul>
</li>
<li><p>停止 Zookeeper</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash">./zkServer.sh stop <span class="token comment">#停止当前zookeeper</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre></li>
<li><p>查看 Zookeeper 状态</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash">./zkServer.sh status <span class="token comment"># 查看zookeeper状态</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre></li>
<li><p>使用客户端连接单机版 Zookeeper</p>
<ul>
<li><code>bin/zkCli.sh</code> 默认连接本地地址，默认端口 2181</li>
<li><code>bin/zkCli.sh -server ip:port</code> 连接指定 IP 地址与端口</li>
</ul>
</li>
</ul>
<h3 id="zookeeper-集群安装与脚本"><a href="#zookeeper-集群安装与脚本" class="headerlink" title="zookeeper 集群安装与脚本"></a>zookeeper 集群安装与脚本</h3><ol>
<li>Zookeeper 集群说明</li>
</ol>
<ul>
<li>zookeeper 集群中的角色<blockquote>
<p>Zookeeper 集群中的角色主要有以下三类:<br><img src="https://s1.ax1x.com/2020/07/30/aMlGOf.png" alt="zookeeper集群角色"></p>
</blockquote>
</li>
</ul>
<ol start="2">
<li>集群安装</li>
</ol>
<blockquote>
<p>为了方便演示，我们用 3 个 zookeeper 搭建一个伪集群，应用部署地址是你的本机，客户端监听的端口分别是 2181、2182、2183 ，投票选举端口分别为 2881/3881、2882/3882、2883/3883</p>
</blockquote>
<ul>
<li><p>在/usr/local 下创建一个目录<br><img src="https://s1.ax1x.com/2020/07/30/aM14Ug.png" alt="zookeeperCluster"></p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token function">mkdir</span> /usr/local/zookeeperCluster<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre></li>
<li><p>把解压后的 zookeeper 目录分别 copy 到这个目录下，并改名</p>
<p><img src="https://s1.ax1x.com/2020/07/30/aM3NGj.png" alt="集群"><br>复制两份 Zookeeper 应用。用于模拟集群中的 3 个节点。</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token function">cp</span> -r zookeeper-3.6.0 /usr/local/zookeeperCluster/
<span class="token function">mv</span> zookeeper-3.6.0 zookeeper01
<span class="token function">cp</span> -r zookeeper01 zookeeper02
<span class="token function">cp</span> -r zookeeper01 zookeeper03<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>提供配置文件</p>
<ul>
<li>给每一个的 conf 目录下添加一个 zoo.cfg</li>
<li>在每一个的根目录下创建 data 目录用于存放缓存</li>
<li>修改 zoo.cfg 中的 dataDir 参数指向 data 目录</li>
</ul>
</li>
<li><p>提供唯一标识</p>
<ul>
<li><p>在 data 目录中创建文件</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash">myid:touch myid<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre></li>
<li><p>为应用提供唯一标识。本环境中使用 1、2、3 作为每个节点的唯一标识。<br><img src="https://s1.ax1x.com/2020/07/30/aM8t0K.png" alt="唯一标识"></p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token builtin class-name">echo</span> <span class="token punctuation">[</span>唯一标识<span class="token punctuation">]</span> <span class="token operator">>></span> myid<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre></li>
</ul>
</li>
<li><p>修改配置文件<code>zoo.cfg</code> 设置监听客户端、投票、选举端口</p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token assign-left variable">clientPort</span><span class="token operator">=</span><span class="token number">2181</span> <span class="token comment">#服务端口根据应用做对应修改,zk01-2181,zk02-2182,zk03-2183</span>
server.1<span class="token operator">=</span><span class="token number">192.168</span>.233.130:2881:3881
server.2<span class="token operator">=</span><span class="token number">192.168</span>.233.130:2882:3882
server.3<span class="token operator">=</span><span class="token number">192.168</span>.233.130:2883:3883<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<p><img src="https://s1.ax1x.com/2020/07/30/aM8ONF.png" alt="举例"></p>
</li>
<li><p>编写启动、关闭集群脚本<br><img src="https://s1.ax1x.com/2020/07/30/aMGBUU.png" alt="编写脚本"></p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token comment"># 在zookeeperCluster下创建一个文件</span>
<span class="token function">touch</span> shutdownAll.sh
<span class="token comment"># 使用 chmod 命令为文件授权</span>
<span class="token function">chmod</span> <span class="token number">777</span> <span class="token punctuation">[</span>文件名<span class="token punctuation">]</span> <span class="token comment"># 777 表示为文件分配可读，可写，可执行权限。</span>

<span class="token comment"># 编写</span>
zookeeper01/bin/zkServer.sh stop
zookeeper02/bin/zkServer.sh stop
zookeeper03/bin/zkServer.sh stop

<span class="token comment"># 同理创建startAll.sh，并授权</span>
<span class="token function">touch</span> startAll.sh
<span class="token function">chmod</span> <span class="token number">777</span> <span class="token punctuation">[</span>文件名<span class="token punctuation">]</span>

<span class="token comment"># 编写</span>
zookeeper01/bin/zkServer.sh start
zookeeper02/bin/zkServer.sh start
zookeeper03/bin/zkServer.sh start<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>连接集群<br><strong>可以使用任何节点中的客户端工具连接集群中的任何节点。</strong></p>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash">./zkCli.sh -server <span class="token number">182.92</span>.159.117:2183<span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<h2 id="Zookeeper-常用命令"><a href="#Zookeeper-常用命令" class="headerlink" title="Zookeeper 常用命令"></a>Zookeeper 常用命令</h2></li>
</ul>
<ol>
<li><p><code>ls</code></p>
<ul>
<li><code>ls /path</code></li>
<li>使用 ls 命令查看 zookeeper 中的内容。在 ZooKeeper 控制台客户端中，没有默认列表功能，必须指定要列表资源的位置。 如： <code>ls /</code> 或者 <code>ls /path</code></li>
</ul>
</li>
<li><p><code>create</code></p>
<blockquote>
<p>使用 create 命令创建一个新的 Znode。<code>create [-e] [-s] path data</code> 创建节点，如： <code>create /test 123</code> 创建一个/test 节点，节点携带数据信息 123。 <code>create -e /test 123</code> 创建一个临时节点/test，携带数据为 123，临时节点只在当前会话生命周期中有效，会话结束节点自动删除。<code>create -s /test 123</code> 创建一个顺序节点/test，携带数据 123，创建的顺序节点由 ZooKeeper 自动为节点增加后缀信息，如-/test00000001 等。-e 和-s 参数可以联合使用。</p>
</blockquote>
</li>
<li><p><code>get</code></p>
<ul>
<li><code>get [-s] /path</code></li>
<li>get 命令获取 Znode 中的数据。</li>
</ul>
</li>
</ol>
<pre class="line-numbers language-bash" data-language="bash"><code class="language-bash"><span class="token punctuation">[</span>zk: <span class="token number">182.92</span>.159.117:2183<span class="token punctuation">(</span>CONNECTED<span class="token punctuation">)</span> <span class="token number">1</span><span class="token punctuation">]</span> get -s /bjsxt <span class="token comment"># 执行语句，获取bjsxt节点的详细信息</span>

<span class="token number">123123123</span> <span class="token comment"># 存放的数据</span>

cZxid <span class="token operator">=</span> 0x200000004 <span class="token comment">#创建时 zxid(znode 每次改变时递增的事务 id)</span>

ctime <span class="token operator">=</span> Mon Jul <span class="token number">27</span> <span class="token number">20</span>:48:56 CST <span class="token number">2020</span> <span class="token comment">#创建时间戳</span>

mZxid <span class="token operator">=</span> 0x200000009 <span class="token comment"># 最近一次更近的 zxid</span>

mtime <span class="token operator">=</span> Mon Jul <span class="token number">27</span> <span class="token number">21</span>:14:54 CST <span class="token number">2020</span> <span class="token comment"># 最近一次更新的时间戳</span>

pZxid <span class="token operator">=</span> 0x30000001c <span class="token comment"># 子节点的zxid</span>

cversion <span class="token operator">=</span> <span class="token number">7</span> <span class="token comment"># 子节点更新次数</span>

dataVersion <span class="token operator">=</span> <span class="token number">1</span> <span class="token comment"># 节点数据更新次数</span>

aclVersion <span class="token operator">=</span> <span class="token number">0</span> <span class="token comment"># 节点 ACL(授权信息)的更新次数</span>

ephemeralOwner <span class="token operator">=</span> 0x0 <span class="token comment"># :如果该节点为ephemeral 节点(临时，生命周期与 session 一样),</span>

dataLength <span class="token operator">=</span> <span class="token number">9</span> <span class="token comment"># 节点数据字节数</span>

numChildren <span class="token operator">=</span> <span class="token number">1</span> <span class="token comment"># 子节点数量</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ol start="4">
<li><p><code>set</code></p>
<ul>
<li><code>set /path [data]</code></li>
<li>添加或修改 Znode 中的值<br><img src="https://s1.ax1x.com/2020/07/31/aMJazd.png" alt="示例"></li>
</ul>
</li>
<li><p><code>delete</code></p>
<ul>
<li><code>delete /path</code></li>
<li>删除 Znode。</li>
</ul>
</li>
</ol>
<h2 id="Java-操作-Zookeeper"><a href="#Java-操作-Zookeeper" class="headerlink" title="Java 操作 Zookeeper"></a>Java 操作 Zookeeper</h2><p><strong>以 maven 项目为例</strong></p>
<ol>
<li><p>创建项目导入 zookeeper 依赖</p>
<pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.apache.zookeeper<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>zookeeper<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>version</span><span class="token punctuation">></span></span>3.6.0<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>version</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>步骤</p>
<ul>
<li><p>新建类，实现 Wather，重写方法</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ZnodeDemo</span> <span class="token keyword">implements</span> <span class="token class-name">Watcher</span> <span class="token punctuation">&#123;</span>

 <span class="token annotation punctuation">@Override</span>
 <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">process</span><span class="token punctuation">(</span><span class="token class-name">WatchedEvent</span> event<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
   <span class="token comment">// 获取链接事件</span>
   <span class="token keyword">if</span> <span class="token punctuation">(</span>event<span class="token punctuation">.</span><span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token class-name">Event<span class="token punctuation">.</span>KeeperState<span class="token punctuation">.</span>SyncConnected</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
       <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"连接成功"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token punctuation">&#125;</span>
 <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>创建连接 Zookeeper 的对象</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
 * @param connectString : 连接的端口，如果是集群需要都写上
 * @param sessionTimeout : 设置超时时间
 * @param watcher : 监视者对象，本例就用自己了
*/</span>
<span class="token class-name">ZooKeeper</span> zooKeeper <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ZooKeeper</span><span class="token punctuation">(</span><span class="token string">"182.92.159.117:2181,182.92.159.117:2182,182.92.159.117:2183"</span><span class="token punctuation">,</span><span class="token number">1500000</span><span class="token punctuation">,</span><span class="token keyword">new</span> <span class="token class-name">ZnodeDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>创建一个 Znode</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/**
* @param path
*                创建节点的路径
* @param data
*                节点要存放的数据
* @param acl
*                访问控制列表
* @param createMode
*                类型，是持久的还是短暂的，是否右zookeeper自动排序
*/</span>
 <span class="token class-name">String</span> path <span class="token operator">=</span> zooKeeper<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token string">"/bjsxt/test"</span><span class="token punctuation">,</span> <span class="token string">"zs"</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token class-name">ZooDefs<span class="token punctuation">.</span>Ids</span><span class="token punctuation">.</span>OPEN_ACL_UNSAFE<span class="token punctuation">,</span> <span class="token class-name">CreateMode</span><span class="token punctuation">.</span>EPHEMERAL_SEQUENTIAL<span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token comment">// 返回类型是个地址，我们输出一下</span>
 <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>path<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>获取 Znode 中的数据</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 获取指定节点的值</span>
 <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> data <span class="token operator">=</span> zooKeeper<span class="token punctuation">.</span><span class="token function">getData</span><span class="token punctuation">(</span>path<span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">ZnodeDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Stat</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre></li>
<li><p>获取所有字节中的数据</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">></span></span> children <span class="token operator">=</span> zooKeeper<span class="token punctuation">.</span><span class="token function">getChildren</span><span class="token punctuation">(</span><span class="token string">"/"</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">ZnodeDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
children<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span>child<span class="token punctuation">)</span><span class="token operator">-></span><span class="token punctuation">&#123;</span>
    <span class="token keyword">try</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> data <span class="token operator">=</span> zooKeeper<span class="token punctuation">.</span><span class="token function">getData</span><span class="token punctuation">(</span><span class="token string">"/"</span> <span class="token operator">+</span> child<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">ZnodeDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Stat</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">KeeperException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span> <span class="token punctuation">&#123;</span>

    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>设置 Znode 中的值</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">//设置 Znode 中的值</span>
<span class="token class-name">Stat</span> stat <span class="token operator">=</span> zooKeeper<span class="token punctuation">.</span><span class="token function">setData</span><span class="token punctuation">(</span><span class="token string">"/bjsxt/test0000000001"</span><span class="token punctuation">,</span><span class="token string">"bjsxt"</span><span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>stat<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre></li>
<li><p>删除 Znode</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">zooKeeper<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span><span class="token string">"/bjsxt/test0000000001"</span><span class="token punctuation">,</span><span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>
<h2 id="基于-RMI-实现远程方法调用"><a href="#基于-RMI-实现远程方法调用" class="headerlink" title="基于 RMI 实现远程方法调用"></a>基于 RMI 实现远程方法调用</h2></li>
</ul>
</li>
<li><p>RMI 介绍</p>
<blockquote>
<p>RMI(Remote Method Invocation) 远程方法调用<br>RMI 是 jdk1.2 推出的功能，它可以实现一个 Java 应用像调用本地项目方法一样调用另一个服务器 Java 应用中的方法<br><strong>RMI 是 Java 语言的远程调用，无法实现跨语言</strong></p>
</blockquote>
</li>
<li><p>执行流程<br><img src="https://s1.ax1x.com/2020/07/31/alW3v9.png" alt="RMI执行流程"></p>
<blockquote>
<p>Registry(注册表)是放置所有服务器对象的命名空间。 每次服务端创建一个对象时，它都会使用 bind()或 rebind()方法注册该对象。 这些是使用称为绑定名称的唯一名称注册的。<br>要调用远程对象，客户端需要该对象的引用。即通过服务端绑定的名称从注册表中获取对象(lookup()方法)。</p>
</blockquote>
</li>
<li><p>RMI 接口介绍</p>
</li>
</ol>
<ul>
<li><p>Remote 接口</p>
<blockquote>
<p><code>java.rmi.Remote</code> 定义了此接口为远程调用接口。如果接口被外部调用，需要继承此接口。</p>
</blockquote>
</li>
<li><p>RemoteException 类</p>
<blockquote>
<p><code>java.rmi.RemoteException</code> 继承了 Remote 接口的接口，如果方法是允许被远程调用的，需要抛出此异常。</p>
</blockquote>
</li>
<li><p>UnicastRemoteObject 类</p>
<blockquote>
<p><code>java.rmi.server.UnicastRemoteObject</code> 此类实现了 Remote 接口和 Serializable 接口。<strong>自定义接口实现类除了实现自定义接口还需要继承此类</strong>。</p>
</blockquote>
</li>
<li><p>LocateRegistry 类</p>
<blockquote>
<p><code>java.rmi.registry.LocateRegistry</code>可以通过 LocateRegistry 在本机上创建 Registry，通过特定的端口就可以访问这个 Registry。</p>
</blockquote>
</li>
<li><p>Naming 类</p>
<blockquote>
<p><code>java.rmi.Naming</code>Naming 定义了发布内容可访问 RMI 名称。也是通过 Naming 获取到指定的远程方法。</p>
</blockquote>
</li>
</ul>
<ol start="4">
<li>代码实现</li>
</ol>
<ul>
<li><p>创建 Server 端</p>
<ul>
<li><p>创建接口<br><img src="https://s1.ax1x.com/2020/07/31/al7YtI.png" alt="service"></p>
<ul>
<li>要继承<code>Rempte</code>接口，并且该接口下的所有被远程调用的方法要抛出<code>RemoteException</code>异常</li>
</ul>
</li>
<li><p>实现接口<br><img src="https://s1.ax1x.com/2020/07/31/al7XjO.png" alt="实现类"></p>
<ul>
<li>实现 <code>Remote</code> 接口的同时必须继承 <code>UnicastRemoteObject</code> 类</li>
</ul>
</li>
<li><p>创建主方法<br><img src="https://s1.ax1x.com/2020/07/31/alHB26.png" alt="启动类"></p>
<ul>
<li>要先实例化对象，再创建本地注册表<code>LocateRegistry</code> 参数是监听本地的端口，看看有没有人去访问者 <code>Registry</code>。最后用 <code>Naming.bind</code> 把注册内容发布出去，可以供其他 RMI 访问</li>
</ul>
</li>
</ul>
</li>
<li><p>创建客户端</p>
<ul>
<li>复制服务端接口，同上</li>
<li>创建主方法<br><img src="https://s1.ax1x.com/2020/07/31/alblod.png" alt="alblod.png"><ul>
<li>主方法中用 Naming 的 lookup 方法访问那个地址，把获取到的对象强转就能调用该对象下的方法了</li>
</ul>
</li>
</ul>
</li>
</ul>
<h2 id="基于-Zookeeper-实现远程方法调用"><a href="#基于-Zookeeper-实现远程方法调用" class="headerlink" title="基于 Zookeeper 实现远程方法调用"></a>基于 Zookeeper 实现远程方法调用</h2><blockquote>
<p>道理跟 RMI 一样，方便了端口的寻找，服务端将暴露出来的端口信息放到 Zookeeper 的一个节点上，客户端去访问这些节点，获取到 path 后用 Naming 的 lookup 获取对应的对象，就能使用远程的方法了</p>
</blockquote>
<ol>
<li><p>创建服务端</p>
<ul>
<li><p>创建项目放入 zookeeper 依赖</p>
<pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.apache.zookeeper<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>zookeeper<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>version</span><span class="token punctuation">></span></span>3.6.0<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>version</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<ul>
<li>创建接口，步骤 RMI 一样</li>
</ul>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">UsersService</span> <span class="token keyword">extends</span> <span class="token class-name">Remote</span> <span class="token punctuation">&#123;</span>
<span class="token class-name">String</span> <span class="token function">findUsers</span><span class="token punctuation">(</span><span class="token class-name">String</span> str<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">RemoteException</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre></li>
<li><p>创建实现类，步骤跟 RMI 的一样</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">UsersServiceImpl</span> <span class="token keyword">extends</span> <span class="token class-name">UnicastRemoteObject</span> <span class="token keyword">implements</span> <span class="token class-name">UsersService</span> <span class="token punctuation">&#123;</span>
   <span class="token keyword">public</span> <span class="token class-name">UsersServiceImpl</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">RemoteException</span> <span class="token punctuation">&#123;</span>
   <span class="token punctuation">&#125;</span>
   <span class="token annotation punctuation">@Override</span>
   <span class="token keyword">public</span> <span class="token class-name">String</span> <span class="token function">findUsers</span><span class="token punctuation">(</span><span class="token class-name">String</span> str<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">RemoteException</span> <span class="token punctuation">&#123;</span>
     <span class="token keyword">return</span> <span class="token string">"Hello Zookeeper "</span><span class="token operator">+</span>str<span class="token punctuation">;</span>
   <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>主方法</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ServerDemo</span> <span class="token keyword">implements</span> <span class="token class-name">Watcher</span> <span class="token punctuation">&#123;</span>
 <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span><span class="token punctuation">,</span><span class="token class-name">AlreadyBoundException</span><span class="token punctuation">,</span> <span class="token class-name">KeeperException</span><span class="token punctuation">,</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">&#123;</span>
   <span class="token comment">// new出要暴露的对象</span>
   <span class="token class-name">UsersService</span> usersService <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">UsersServiceImpl</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token comment">// 开启本地监听8888</span>
   <span class="token class-name">LocateRegistry</span><span class="token punctuation">.</span><span class="token function">createRegistry</span><span class="token punctuation">(</span><span class="token number">8888</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token comment">// 设置url</span>
   <span class="token class-name">String</span> url <span class="token operator">=</span><span class="token string">"rmi://localhost:8888/user"</span><span class="token punctuation">;</span>
   <span class="token comment">// Naming 绑定他们</span>
   <span class="token class-name">Naming</span><span class="token punctuation">.</span><span class="token function">bind</span><span class="token punctuation">(</span>url<span class="token punctuation">,</span>usersService<span class="token punctuation">)</span><span class="token punctuation">;</span>

   <span class="token comment">// 创建Zookeeper对象</span>
   <span class="token class-name">ZooKeeper</span> zooKeeper <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ZooKeeper</span><span class="token punctuation">(</span><span class="token string">"182.92.159.117:2181,182.92.159.117:2182,182.92.159.117:2183"</span><span class="token punctuation">,</span><span class="token number">150000</span><span class="token punctuation">,</span><span class="token keyword">new</span> <span class="token class-name">ServerDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token comment">// 把url信息放入到zookeeper节点中</span>
   zooKeeper<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token string">"/bjsxt/service"</span><span class="token punctuation">,</span>url<span class="token punctuation">.</span><span class="token function">getBytes</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token class-name">ZooDefs<span class="token punctuation">.</span>Ids</span><span class="token punctuation">.</span>OPEN_ACL_UNSAFE<span class="token punctuation">,</span><span class="token class-name">CreateMode</span><span class="token punctuation">.</span>PERSISTENT<span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token comment">// 打印服务发布成功</span>
   <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"服务发布成功"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
</ul>
</li>
<li><p>创建客户端</p>
<ul>
<li><p>创建项目放入 zookeeper 依赖</p>
<pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.apache.zookeeper<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>zookeeper<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>version</span><span class="token punctuation">></span></span>3.6.0<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>version</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>创建接口</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java">
<span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">UsersService</span> <span class="token punctuation">&#123;</span>
  <span class="token class-name">String</span> <span class="token function">findUsers</span><span class="token punctuation">(</span><span class="token class-name">String</span> str<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre></li>
<li><p>创建主方法</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">/*
 要使用zookeeper，需要一个watcher监控，本例就用自己。 要重写process方法
*/</span>
 <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">ClientDemo</span> <span class="token keyword">implements</span> <span class="token class-name">Watcher</span> <span class="token punctuation">&#123;</span>
   <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">IOException</span><span class="token punctuation">,</span><span class="token class-name">KeeperException</span><span class="token punctuation">,</span> <span class="token class-name">InterruptedException</span><span class="token punctuation">,</span><span class="token class-name">NotBoundException</span><span class="token punctuation">&#123;</span>
     <span class="token comment">// 创建zookeeper对象</span>
     <span class="token class-name">ZooKeeper</span> zooKeeper <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ZooKeeper</span><span class="token punctuation">(</span><span class="token string">"182.92.159.117:2181,182.92.159.117:2182,182.92.159.117:2183"</span><span class="token punctuation">,</span><span class="token number">150000</span><span class="token punctuation">,</span><span class="token keyword">new</span> <span class="token class-name">ClientDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token comment">// 从zookeeper上获取节点信息，是字节数组</span>
     <span class="token keyword">byte</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bytes <span class="token operator">=</span> zooKeeper<span class="token punctuation">.</span><span class="token function">getData</span><span class="token punctuation">(</span><span class="token string">"/bjsxt/service"</span><span class="token punctuation">,</span><span class="token function">newClientDemo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token comment">// 字节数组转换成字符串</span>
     <span class="token class-name">String</span> url <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>bytes<span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token comment">// 通过Naming类的lookup方法获取到对象</span>
     <span class="token class-name">UsersService</span> usersService <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">UsersService</span><span class="token punctuation">)</span><span class="token class-name">Naming</span><span class="token punctuation">.</span><span class="token function">lookup</span><span class="token punctuation">(</span>url<span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token comment">// 调用远程的方法</span>
     <span class="token class-name">String</span> result <span class="token operator">=</span> usersService<span class="token punctuation">.</span><span class="token function">findUsers</span><span class="token punctuation">(</span><span class="token string">"zhy"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
     <span class="token comment">// 输出结果</span>
     <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>result<span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token punctuation">&#125;</span>
   <span class="token comment">/*
     实现Watcher接口要重写的方法
     用于监听zookeeper是否连接成功，可以进一步操作
   */</span>
   <span class="token annotation punctuation">@Override</span>
   <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">process</span><span class="token punctuation">(</span><span class="token class-name">WatchedEvent</span> event<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
   <span class="token keyword">if</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span><span class="token function">getState</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> <span class="token class-name">Event<span class="token punctuation">.</span>KeeperState<span class="token punctuation">.</span>SyncConnected</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
       <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"连接成功"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
   <span class="token punctuation">&#125;</span>
 <span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre></li>
</ul>
</li>
</ol>

                
            </div>
            <hr/>

            

    <div class="reprint" id="reprint-statement">
        
            <div class="reprint__author">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-user">
                        文章作者:
                    </i>
                </span>
                <span class="reprint-info">
                    <a href="/about" rel="external nofollow noreferrer">Max</a>
                </span>
            </div>
            <div class="reprint__type">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-link">
                        文章链接:
                    </i>
                </span>
                <span class="reprint-info">
                    <a href="https://zhy2021.github.io/2020/07/27/zookeeper-xue-xi/">https://zhy2021.github.io/2020/07/27/zookeeper-xue-xi/</a>
                </span>
            </div>
            <div class="reprint__notice">
                <span class="reprint-meta" style="font-weight: bold;">
                    <i class="fas fa-copyright">
                        版权声明:
                    </i>
                </span>
                <span class="reprint-info">
                    本博客所有文章除特別声明外，均采用
                    <a href="https://creativecommons.org/licenses/by/4.0/deed.zh" rel="external nofollow noreferrer" target="_blank">CC BY 4.0</a>
                    许可协议。转载请注明来源
                    <a href="/about" target="_blank">Max</a>
                    !
                </span>
            </div>
        
    </div>

    <script async defer>
      document.addEventListener("copy", function (e) {
        let toastHTML = '<span>复制成功，请遵循本文的转载规则</span><button class="btn-flat toast-action" onclick="navToReprintStatement()" style="font-size: smaller">查看</a>';
        M.toast({html: toastHTML})
      });

      function navToReprintStatement() {
        $("html, body").animate({scrollTop: $("#reprint-statement").offset().top - 80}, 800);
      }
    </script>



            <div class="tag_share" style="display: block;">
                <div class="post-meta__tag-list" style="display: inline-block;">
                    
                        <div class="article-tag">
                            
                                <a href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E6%8A%80%E6%9C%AF/">
                                    <span class="chip bg-color">分布式技术</span>
                                </a>
                            
                                <a href="/tags/Zookeeper/">
                                    <span class="chip bg-color">Zookeeper</span>
                                </a>
                            
                        </div>
                    
                </div>
                <div class="post_share" style="zoom: 80%; width: fit-content; display: inline-block; float: right; margin: -0.15rem 0;">
                    <link rel="stylesheet" type="text/css" href="/libs/share/css/share.min.css">
<div id="article-share">

    
    <div class="social-share" data-sites="twitter,facebook,google,qq,qzone,wechat,weibo,douban,linkedin" data-wechat-qrcode-helper="<p>微信扫一扫即可分享！</p>"></div>
    <script src="/libs/share/js/social-share.min.js"></script>
    

    

</div>

                </div>
            </div>
            
        </div>
    </div>

    

    

    

    

    
        <style>
    .valine-card {
        margin: 1.5rem auto;
    }

    .valine-card .card-content {
        padding: 20px 20px 5px 20px;
    }

    #vcomments textarea {
        box-sizing: border-box;
        background: url("/medias/comment_bg.png") 100% 100% no-repeat;
    }

    #vcomments p {
        margin: 2px 2px 10px;
        font-size: 1.05rem;
        line-height: 1.78rem;
    }

    #vcomments blockquote p {
        text-indent: 0.2rem;
    }

    #vcomments a {
        padding: 0 2px;
        color: #4cbf30;
        font-weight: 500;
        text-decoration: none;
    }

    #vcomments img {
        max-width: 100%;
        height: auto;
        cursor: pointer;
    }

    #vcomments ol li {
        list-style-type: decimal;
    }

    #vcomments ol,
    ul {
        display: block;
        padding-left: 2em;
        word-spacing: 0.05rem;
    }

    #vcomments ul li,
    ol li {
        display: list-item;
        line-height: 1.8rem;
        font-size: 1rem;
    }

    #vcomments ul li {
        list-style-type: disc;
    }

    #vcomments ul ul li {
        list-style-type: circle;
    }

    #vcomments table, th, td {
        padding: 12px 13px;
        border: 1px solid #dfe2e5;
    }

    #vcomments table, th, td {
        border: 0;
    }

    table tr:nth-child(2n), thead {
        background-color: #fafafa;
    }

    #vcomments table th {
        background-color: #f2f2f2;
        min-width: 80px;
    }

    #vcomments table td {
        min-width: 80px;
    }

    #vcomments h1 {
        font-size: 1.85rem;
        font-weight: bold;
        line-height: 2.2rem;
    }

    #vcomments h2 {
        font-size: 1.65rem;
        font-weight: bold;
        line-height: 1.9rem;
    }

    #vcomments h3 {
        font-size: 1.45rem;
        font-weight: bold;
        line-height: 1.7rem;
    }

    #vcomments h4 {
        font-size: 1.25rem;
        font-weight: bold;
        line-height: 1.5rem;
    }

    #vcomments h5 {
        font-size: 1.1rem;
        font-weight: bold;
        line-height: 1.4rem;
    }

    #vcomments h6 {
        font-size: 1rem;
        line-height: 1.3rem;
    }

    #vcomments p {
        font-size: 1rem;
        line-height: 1.5rem;
    }

    #vcomments hr {
        margin: 12px 0;
        border: 0;
        border-top: 1px solid #ccc;
    }

    #vcomments blockquote {
        margin: 15px 0;
        border-left: 5px solid #42b983;
        padding: 1rem 0.8rem 0.3rem 0.8rem;
        color: #666;
        background-color: rgba(66, 185, 131, .1);
    }

    #vcomments pre {
        font-family: monospace, monospace;
        padding: 1.2em;
        margin: .5em 0;
        background: #272822;
        overflow: auto;
        border-radius: 0.3em;
        tab-size: 4;
    }

    #vcomments code {
        font-family: monospace, monospace;
        padding: 1px 3px;
        font-size: 0.92rem;
        color: #e96900;
        background-color: #f8f8f8;
        border-radius: 2px;
    }

    #vcomments pre code {
        font-family: monospace, monospace;
        padding: 0;
        color: #e8eaf6;
        background-color: #272822;
    }

    #vcomments pre[class*="language-"] {
        padding: 1.2em;
        margin: .5em 0;
    }

    #vcomments code[class*="language-"],
    pre[class*="language-"] {
        color: #e8eaf6;
    }

    #vcomments [type="checkbox"]:not(:checked), [type="checkbox"]:checked {
        position: inherit;
        margin-left: -1.3rem;
        margin-right: 0.4rem;
        margin-top: -1px;
        vertical-align: middle;
        left: unset;
        visibility: visible;
    }

    #vcomments b,
    strong {
        font-weight: bold;
    }

    #vcomments dfn {
        font-style: italic;
    }

    #vcomments small {
        font-size: 85%;
    }

    #vcomments cite {
        font-style: normal;
    }

    #vcomments mark {
        background-color: #fcf8e3;
        padding: .2em;
    }

    #vcomments table, th, td {
        padding: 12px 13px;
        border: 1px solid #dfe2e5;
    }

    table tr:nth-child(2n), thead {
        background-color: #fafafa;
    }

    #vcomments table th {
        background-color: #f2f2f2;
        min-width: 80px;
    }

    #vcomments table td {
        min-width: 80px;
    }

    #vcomments [type="checkbox"]:not(:checked), [type="checkbox"]:checked {
        position: inherit;
        margin-left: -1.3rem;
        margin-right: 0.4rem;
        margin-top: -1px;
        vertical-align: middle;
        left: unset;
        visibility: visible;
    }
</style>

<div class="card valine-card" data-aos="fade-up">
    <div class="comment_headling" style="font-size: 20px; font-weight: 700; position: relative; padding-left: 20px; top: 15px; padding-bottom: 5px;">
        <i class="fas fa-comments fa-fw" aria-hidden="true"></i>
        <span>评论</span>
    </div>
    <div id="vcomments" class="card-content" style="display: grid">
    </div>
</div>

<script src="/libs/valine/av-min.js"></script>
<script src="/libs/valine/Valine.min.js"></script>
<script>
    new Valine({
        el: '#vcomments',
        appId: '5FkhQebEqGdoNnuL654mv5KM-gzGzoHsz',
        appKey: 'NNEBzCiygD4tBLqHt8diLxda',
        notify: 'true' === 'true',
        verify: 'true' === 'true',
        visitor: 'true' === 'true',
        avatar: 'mm',
        pageSize: '10',
        lang: 'zh-cn',
        placeholder: 'just go go'
    });
</script>

    

    

    

    

    

<article id="prenext-posts" class="prev-next articles">
    <div class="row article-row">
        
        <div class="article col s12 m6" data-aos="fade-up">
            <div class="article-badge left-badge text-color">
                <i class="fas fa-chevron-left"></i>&nbsp;上一篇</div>
            <div class="card">
                <a href="/2020/08/01/dubbo-xue-xi-he-shi-zhan/">
                    <div class="card-image">
                        
                        
                        <img src="/medias/featureimages/18.jpg" class="responsive-img" alt="Dubbo学习和实战">
                        
                        <span class="card-title">Dubbo学习和实战</span>
                    </div>
                </a>
                <div class="card-content article-content">
                    <div class="summary block-with-text">
                        
                            Dubbo是一款高性能、轻量级的开源Java RPC框架，它提供了三大核心能力：面向接口的远程方法调用，智能容错和负载均衡，以及服务自动注册和发现。
                        
                    </div>
                    <div class="publish-info">
                        <span class="publish-date">
                            <i class="far fa-clock fa-fw icon-date"></i>2020-08-01
                        </span>
                        <span class="publish-author">
                            
                            <i class="fas fa-bookmark fa-fw icon-category"></i>
                            
                            <a href="/categories/Dubbo/" class="post-category">
                                    Dubbo
                                </a>
                            
                            
                        </span>
                    </div>
                </div>
                
                <div class="card-action article-tags">
                    
                    <a href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F/">
                        <span class="chip bg-color">分布式</span>
                    </a>
                    
                    <a href="/tags/Dubbo/">
                        <span class="chip bg-color">Dubbo</span>
                    </a>
                    
                </div>
                
            </div>
        </div>
        
        
        <div class="article col s12 m6" data-aos="fade-up">
            <div class="article-badge right-badge text-color">
                下一篇&nbsp;<i class="fas fa-chevron-right"></i>
            </div>
            <div class="card">
                <a href="/2020/07/04/redis-xue-xi/">
                    <div class="card-image">
                        
                        
                        <img src="/medias/featureimages/5.jpg" class="responsive-img" alt="redis学习">
                        
                        <span class="card-title">redis学习</span>
                    </div>
                </a>
                <div class="card-content article-content">
                    <div class="summary block-with-text">
                        
                            redis学习,本篇借鉴狂神说Java
                        
                    </div>
                    <div class="publish-info">
                            <span class="publish-date">
                                <i class="far fa-clock fa-fw icon-date"></i>2020-07-04
                            </span>
                        <span class="publish-author">
                            
                            <i class="fas fa-bookmark fa-fw icon-category"></i>
                            
                            <a href="/categories/redis/" class="post-category">
                                    redis
                                </a>
                            
                            
                        </span>
                    </div>
                </div>
                
                <div class="card-action article-tags">
                    
                    <a href="/tags/redis/">
                        <span class="chip bg-color">redis</span>
                    </a>
                    
                </div>
                
            </div>
        </div>
        
    </div>
</article>

</div>


<script>
    $('#articleContent').on('copy', function (e) {
        // IE8 or earlier browser is 'undefined'
        if (typeof window.getSelection === 'undefined') return;

        var selection = window.getSelection();
        // if the selection is short let's not annoy our users.
        if (('' + selection).length < Number.parseInt('120')) {
            return;
        }

        // create a div outside of the visible area and fill it with the selected text.
        var bodyElement = document.getElementsByTagName('body')[0];
        var newdiv = document.createElement('div');
        newdiv.style.position = 'absolute';
        newdiv.style.left = '-99999px';
        bodyElement.appendChild(newdiv);
        newdiv.appendChild(selection.getRangeAt(0).cloneContents());

        // we need a <pre> tag workaround.
        // otherwise the text inside "pre" loses all the line breaks!
        if (selection.getRangeAt(0).commonAncestorContainer.nodeName === 'PRE') {
            newdiv.innerHTML = "<pre>" + newdiv.innerHTML + "</pre>";
        }

        var url = document.location.href;
        newdiv.innerHTML += '<br />'
            + '来源: Max|Blog<br />'
            + '文章作者: Max<br />'
            + '文章链接: <a href="' + url + '">' + url + '</a><br />'
            + '本文章著作权归作者所有，任何形式的转载都请注明出处。';

        selection.selectAllChildren(newdiv);
        window.setTimeout(function () {bodyElement.removeChild(newdiv);}, 200);
    });
</script>


<!-- 代码块功能依赖 -->
<script type="text/javascript" src="/libs/codeBlock/codeBlockFuction.js"></script>

<!-- 代码语言 -->

<script type="text/javascript" src="/libs/codeBlock/codeLang.js"></script>


<!-- 代码块复制 -->

<script type="text/javascript" src="/libs/codeBlock/codeCopy.js"></script>


<!-- 代码块收缩 -->

<script type="text/javascript" src="/libs/codeBlock/codeShrink.js"></script>


    </div>
    <div id="toc-aside" class="expanded col l3 hide-on-med-and-down">
        <div class="toc-widget card" style="background-color: white;">
            <div class="toc-title"><i class="far fa-list-alt"></i>&nbsp;&nbsp;目录</div>
            <div id="toc-content"></div>
        </div>
    </div>
</div>

<!-- TOC 悬浮按钮. -->

<div id="floating-toc-btn" class="hide-on-med-and-down">
    <a class="btn-floating btn-large bg-color">
        <i class="fas fa-list-ul"></i>
    </a>
</div>


<script src="/libs/tocbot/tocbot.min.js"></script>
<script>
    $(function () {
        tocbot.init({
            tocSelector: '#toc-content',
            contentSelector: '#articleContent',
            headingsOffset: -($(window).height() * 0.4 - 45),
            collapseDepth: Number('0'),
            headingSelector: 'h2, h3, h4'
        });

        // modify the toc link href to support Chinese.
        let i = 0;
        let tocHeading = 'toc-heading-';
        $('#toc-content a').each(function () {
            $(this).attr('href', '#' + tocHeading + (++i));
        });

        // modify the heading title id to support Chinese.
        i = 0;
        $('#articleContent').children('h2, h3, h4').each(function () {
            $(this).attr('id', tocHeading + (++i));
        });

        // Set scroll toc fixed.
        let tocHeight = parseInt($(window).height() * 0.4 - 64);
        let $tocWidget = $('.toc-widget');
        $(window).scroll(function () {
            let scroll = $(window).scrollTop();
            /* add post toc fixed. */
            if (scroll > tocHeight) {
                $tocWidget.addClass('toc-fixed');
            } else {
                $tocWidget.removeClass('toc-fixed');
            }
        });

        
        /* 修复文章卡片 div 的宽度. */
        let fixPostCardWidth = function (srcId, targetId) {
            let srcDiv = $('#' + srcId);
            if (srcDiv.length === 0) {
                return;
            }

            let w = srcDiv.width();
            if (w >= 450) {
                w = w + 21;
            } else if (w >= 350 && w < 450) {
                w = w + 18;
            } else if (w >= 300 && w < 350) {
                w = w + 16;
            } else {
                w = w + 14;
            }
            $('#' + targetId).width(w);
        };

        // 切换TOC目录展开收缩的相关操作.
        const expandedClass = 'expanded';
        let $tocAside = $('#toc-aside');
        let $mainContent = $('#main-content');
        $('#floating-toc-btn .btn-floating').click(function () {
            if ($tocAside.hasClass(expandedClass)) {
                $tocAside.removeClass(expandedClass).hide();
                $mainContent.removeClass('l9');
            } else {
                $tocAside.addClass(expandedClass).show();
                $mainContent.addClass('l9');
            }
            fixPostCardWidth('artDetail', 'prenext-posts');
        });
        
    });
</script>

    

</main>


<script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=default"></script>

    <footer class="page-footer bg-color">
    
        <link rel="stylesheet" href="/libs/aplayer/APlayer.min.css">
<style>
    .aplayer .aplayer-lrc p {
        
        display: none;
        
        font-size: 12px;
        font-weight: 700;
        line-height: 16px !important;
    }

    .aplayer .aplayer-lrc p.aplayer-lrc-current {
        
        display: none;
        
        font-size: 15px;
        color: #42b983;
    }

    
    .aplayer.aplayer-fixed.aplayer-narrow .aplayer-body {
        left: -66px !important;
    }

    .aplayer.aplayer-fixed.aplayer-narrow .aplayer-body:hover {
        left: 0px !important;
    }

    
</style>
<div class="">
    
    <div class="row">
        <meting-js class="col l8 offset-l2 m10 offset-m1 s12"
                   server="netease"
                   type="playlist"
                   id="2844914148"
                   fixed='true'
                   autoplay='false'
                   theme='#42b983'
                   loop='all'
                   order='random'
                   preload='auto'
                   volume='0.7'
                   list-folded='true'
        >
        </meting-js>
    </div>
</div>

<script src="/libs/aplayer/APlayer.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/meting@2/dist/Meting.min.js"></script>

    
    <div class="container row center-align" style="margin-bottom: 15px !important;">
        <div class="col s12 m8 l8 copy-right">
            Copyright&nbsp;&copy;
            
                <span id="year">2020-2021</span>
            
            <span id="year">2020</span>
            <a href="/about" target="_blank">Max</a>
            |&nbsp;Powered by&nbsp;<a href="https://hexo.io/" target="_blank">Hexo</a>
            |&nbsp;Theme&nbsp;<a href="https://github.com/blinkfox/hexo-theme-matery" target="_blank">Matery</a>
            <br>
            
            &nbsp;<i class="fas fa-chart-area"></i>&nbsp;站点总字数:&nbsp;<span
                class="white-color">141.4k</span>&nbsp;字
            
            
            
            
            
            
            <span id="busuanzi_container_site_pv">
                |&nbsp;<i class="far fa-eye"></i>&nbsp;总访问量:&nbsp;<span id="busuanzi_value_site_pv"
                    class="white-color"></span>&nbsp;次
            </span>
            
            
            <span id="busuanzi_container_site_uv">
                |&nbsp;<i class="fas fa-users"></i>&nbsp;总访问人数:&nbsp;<span id="busuanzi_value_site_uv"
                    class="white-color"></span>&nbsp;人
            </span>
            
            <br>
            
            <span id="sitetime">载入运行时间...</span>
            <script>
                function siteTime() {
                    var seconds = 1000;
                    var minutes = seconds * 60;
                    var hours = minutes * 60;
                    var days = hours * 24;
                    var years = days * 365;
                    var today = new Date();
                    var startYear = "2020";
                    var startMonth = "2";
                    var startDate = "13";
                    var startHour = "0";
                    var startMinute = "0";
                    var startSecond = "0";
                    var todayYear = today.getFullYear();
                    var todayMonth = today.getMonth() + 1;
                    var todayDate = today.getDate();
                    var todayHour = today.getHours();
                    var todayMinute = today.getMinutes();
                    var todaySecond = today.getSeconds();
                    var t1 = Date.UTC(startYear, startMonth, startDate, startHour, startMinute, startSecond);
                    var t2 = Date.UTC(todayYear, todayMonth, todayDate, todayHour, todayMinute, todaySecond);
                    var diff = t2 - t1;
                    var diffYears = Math.floor(diff / years);
                    var diffDays = Math.floor((diff / days) - diffYears * 365);
                    var diffHours = Math.floor((diff - (diffYears * 365 + diffDays) * days) / hours);
                    var diffMinutes = Math.floor((diff - (diffYears * 365 + diffDays) * days - diffHours * hours) /
                        minutes);
                    var diffSeconds = Math.floor((diff - (diffYears * 365 + diffDays) * days - diffHours * hours -
                        diffMinutes * minutes) / seconds);
                    if (startYear == todayYear) {
                        document.getElementById("year").innerHTML = todayYear;
                        document.getElementById("sitetime").innerHTML = "本站已安全运行 " + diffDays + " 天 " + diffHours +
                            " 小时 " + diffMinutes + " 分钟 " + diffSeconds + " 秒";
                    } else {
                        document.getElementById("year").innerHTML = startYear + " - " + todayYear;
                        document.getElementById("sitetime").innerHTML = "本站已安全运行 " + diffYears + " 年 " + diffDays +
                            " 天 " + diffHours + " 小时 " + diffMinutes + " 分钟 " + diffSeconds + " 秒";
                    }
                }
                setInterval(siteTime, 1000);
            </script>
            
            <br>
            
        </div>
        <div class="col s12 m4 l4 social-link social-statis">
    <a href="https://github.com/blinkfox" class="tooltipped" target="_blank" data-tooltip="访问我的GitHub" data-position="top" data-delay="50">
        <i class="fab fa-github"></i>
    </a>



    <a href="mailto:1181062873@qq.com" class="tooltipped" target="_blank" data-tooltip="邮件联系我" data-position="top" data-delay="50">
        <i class="fas fa-envelope-open"></i>
    </a>







    <a href="tencent://AddContact/?fromId=50&fromSubId=1&subcmd=all&uin=1181062873" class="tooltipped" target="_blank" data-tooltip="QQ联系我: 1181062873" data-position="top" data-delay="50">
        <i class="fab fa-qq"></i>
    </a>







    <a href="/atom.xml" class="tooltipped" target="_blank" data-tooltip="RSS 订阅" data-position="top" data-delay="50">
        <i class="fas fa-rss"></i>
    </a>

</div>
    </div>
</footer>

<div class="progress-bar"></div>


    <!-- 搜索遮罩框 -->
<div id="searchModal" class="modal">
    <div class="modal-content">
        <div class="search-header">
            <span class="title"><i class="fas fa-search"></i>&nbsp;&nbsp;搜索</span>
            <input type="search" id="searchInput" name="s" placeholder="请输入搜索的关键字"
                   class="search-input">
        </div>
        <div id="searchResult"></div>
    </div>
</div>

<script type="text/javascript">
$(function () {
    var searchFunc = function (path, search_id, content_id) {
        'use strict';
        $.ajax({
            url: path,
            dataType: "xml",
            success: function (xmlResponse) {
                // get the contents from search data
                var datas = $("entry", xmlResponse).map(function () {
                    return {
                        title: $("title", this).text(),
                        content: $("content", this).text(),
                        url: $("url", this).text()
                    };
                }).get();
                var $input = document.getElementById(search_id);
                var $resultContent = document.getElementById(content_id);
                $input.addEventListener('input', function () {
                    var str = '<ul class=\"search-result-list\">';
                    var keywords = this.value.trim().toLowerCase().split(/[\s\-]+/);
                    $resultContent.innerHTML = "";
                    if (this.value.trim().length <= 0) {
                        return;
                    }
                    // perform local searching
                    datas.forEach(function (data) {
                        var isMatch = true;
                        var data_title = data.title.trim().toLowerCase();
                        var data_content = data.content.trim().replace(/<[^>]+>/g, "").toLowerCase();
                        var data_url = data.url;
                        data_url = data_url.indexOf('/') === 0 ? data.url : '/' + data_url;
                        var index_title = -1;
                        var index_content = -1;
                        var first_occur = -1;
                        // only match artiles with not empty titles and contents
                        if (data_title !== '' && data_content !== '') {
                            keywords.forEach(function (keyword, i) {
                                index_title = data_title.indexOf(keyword);
                                index_content = data_content.indexOf(keyword);
                                if (index_title < 0 && index_content < 0) {
                                    isMatch = false;
                                } else {
                                    if (index_content < 0) {
                                        index_content = 0;
                                    }
                                    if (i === 0) {
                                        first_occur = index_content;
                                    }
                                }
                            });
                        }
                        // show search results
                        if (isMatch) {
                            str += "<li><a href='" + data_url + "' class='search-result-title'>" + data_title + "</a>";
                            var content = data.content.trim().replace(/<[^>]+>/g, "");
                            if (first_occur >= 0) {
                                // cut out 100 characters
                                var start = first_occur - 20;
                                var end = first_occur + 80;
                                if (start < 0) {
                                    start = 0;
                                }
                                if (start === 0) {
                                    end = 100;
                                }
                                if (end > content.length) {
                                    end = content.length;
                                }
                                var match_content = content.substr(start, end);
                                // highlight all keywords
                                keywords.forEach(function (keyword) {
                                    var regS = new RegExp(keyword, "gi");
                                    match_content = match_content.replace(regS, "<em class=\"search-keyword\">" + keyword + "</em>");
                                });

                                str += "<p class=\"search-result\">" + match_content + "...</p>"
                            }
                            str += "</li>";
                        }
                    });
                    str += "</ul>";
                    $resultContent.innerHTML = str;
                });
            }
        });
    };

    searchFunc('/search.xml', 'searchInput', 'searchResult');
});
</script>

    <!-- 回到顶部按钮 -->
<div id="backTop" class="top-scroll">
    <a class="btn-floating btn-large waves-effect waves-light" href="#!">
        <i class="fas fa-arrow-up"></i>
    </a>
</div>


    <script src="/libs/materialize/materialize.min.js"></script>
    <script src="/libs/masonry/masonry.pkgd.min.js"></script>
    <script src="/libs/aos/aos.js"></script>
    <script src="/libs/scrollprogress/scrollProgress.min.js"></script>
    <script src="/libs/lightGallery/js/lightgallery-all.min.js"></script>
    <script src="/js/matery.js"></script>

    <!-- Baidu Analytics -->

    <!-- Baidu Push -->

<script>
    (function () {
        var bp = document.createElement('script');
        var curProtocol = window.location.protocol.split(':')[0];
        if (curProtocol === 'https') {
            bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
        } else {
            bp.src = 'http://push.zhanzhang.baidu.com/push.js';
        }
        var s = document.getElementsByTagName("script")[0];
        s.parentNode.insertBefore(bp, s);
    })();
</script>

    
    
    <script async src="/libs/others/busuanzi.pure.mini.js"></script>
    

    

    

    <!--腾讯兔小巢-->
    
    

    

    

    
    <script src="/libs/instantpage/instantpage.js" type="module"></script>
    

</body>

</html>
